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a in (-oo:+oo)
a-(3*(a+4/3)) = 2*a+3 // - 2*a+3
a-(3*(a+4/3))-(2*a)-3 = 0
a-3*(a+4/3)-2*a-3 = 0
a-3*(a+4/3)-2*a-3 = 0
-2*a-2*a-4-3 = 0
-4*a-4-3 = 0
-4*a-7 = 0
-4*a-7 = 0
-4*a-7 = 0 // + 7
-4*a = 7 // : -4
a = 7/(-4)
a = -7/4
a = -7/4
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